ifdtool: Add missing chipset_name

Add denverton soc chipset name.

Change-Id: I0fd8494123490d6ccc21af2ed30c30d50ddb4e8e
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68693
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/ifdtool/ifdtool.c

@@ -96,6 +96,7 @@ static const char *const ich_chipset_names[] = {
 	"400 series Ice Point",
 	"500 series Tiger Point/ 600 series Alder Point",
 	"C620 series Lewisburg",
+	"Denverton: C39xx",
 	NULL
 };